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/*=========================================================================
*
* Copyright NumFOCUS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkBinomialBlurImageFilter_h
#define itkBinomialBlurImageFilter_h
#include "itkImageFunction.h"
#include "itkImageRegionIterator.h"
#include "itkImageToImageFilter.h"
#include "itkSize.h"
namespace itk
{
/**
* \class BinomialBlurImageFilter
* \brief Performs a separable blur on each dimension of an image.
*
* The binomial blur consists of a nearest neighbor average along each
* image dimension. The net result after n-iterations approaches
* convolution with a gaussian.
*
* \ingroup ImageEnhancement
* \ingroup ITKSmoothing
*
* \sphinx
* \sphinxexample{Filtering/Smoothing/BlurringAnImageUsingABinomialKernel,Blurring An Image Using A Binomial Kernel}
* \endsphinx
*/
template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT BinomialBlurImageFilter : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(BinomialBlurImageFilter);
/** Standard class type aliases. */
using Self = BinomialBlurImageFilter;
using Superclass = ImageToImageFilter<TInputImage, TOutputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(BinomialBlurImageFilter);
/** Number of dimensions */
static constexpr unsigned int NDimensions = TInputImage::ImageDimension;
static constexpr unsigned int NOutputDimensions = TOutputImage::ImageDimension;
/** Typedef for images */
using InputImageType = TInputImage;
using OutputImageType = TOutputImage;
using OutputImagePointer = typename OutputImageType::Pointer;
using InputImagePointer = typename InputImageType::Pointer;
using InputImageConstPointer = typename InputImageType::ConstPointer;
/** Image size type alias */
using SizeType = Size<Self::NDimensions>;
/** Image index type alias */
using IndexType = typename TOutputImage::IndexType;
/** Image pixel value type alias */
using PixelType = typename TOutputImage::PixelType;
/** Typedef to describe the output image region type. */
using OutputImageRegionType = typename TOutputImage::RegionType;
/** Get and set the number of times to repeat the filter. */
itkSetMacro(Repetitions, unsigned int);
itkGetConstMacro(Repetitions, unsigned int);
/** This filter needs to request a larger input than its requested output.
* If this filter runs "Repetitions" iterations, then it needs an input
* that is 2*Repetitions larger than the output. In other words, this
* filter needs a border of "Repetitions" pixels. */
void
GenerateInputRequestedRegion() override;
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro(SameDimensionCheck, (Concept::SameDimension<Self::NDimensions, Self::NOutputDimensions>));
itkConceptMacro(InputConvertibleToDoubleCheck, (Concept::Convertible<typename TInputImage::PixelType, double>));
itkConceptMacro(DoubleConvertibleToOutputCheck, (Concept::Convertible<double, PixelType>));
// End concept checking
#endif
protected:
BinomialBlurImageFilter();
~BinomialBlurImageFilter() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
/** Method for evaluating the implicit function over the image. */
void
GenerateData() override;
private:
/** How many times should we apply the blur? */
unsigned int m_Repetitions{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkBinomialBlurImageFilter.hxx"
#endif
#endif
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